A motocross racer hits a checkpoint 25 s into a race that is 320 m [E]...
In a relay race, each contestant runs a distance 26.0 m while carrying an egg balanced on a spoon, turns around, and comes back to the starting point. Edith runs the first distance 26.0 m in a time t1 = 20.7 s . On the return trip she is more confident and takes only time t2 = 14.8 s . a) What is the magnitude of her average velocity for the first distance 26.0 b) What is the magnitude of...
In a relay race, each contestant runs a distance 24.0 m while carrying an egg balanced on a spoon, turns around, and comes back to the starting point. Edith runs the first distance 24.0 m in a time t1 = 19.5 s . On the return trip she is more confident and takes only time t2 = 14.7 s . A. What is the magnitude of her average velocity for the first distance 24.0 m ? B. What is the...
A projectile is launched with an initial speed of 40 m/s at an angle of 25° above the horizontal. (a) What are the horizontal and the vertical components of initial velocity. (b) Find the time taken by the projectile to reach the highest point and its height at the highest point. (c) How long does it take the projectile to hit the ground after launch and how far from the starting point it hits the ground. (d) Calculate the velocity...
2. A water balloon is thrown upward from a window 25 m above the ground and hits the ground 2.95 s later. What's the maximum height above the window that the balloon reaches? a) 3.77 m b) 2.59 m c) 2.21 m d ) 1.82 m e) 1.17 m 400 m 3. A student who can swim with a speed of 2.5 m/s in still water wants to get to the other side of a 400 m wide river whose...
A race car moves such that its position fits the
relationship
x = (5.5 m/s)t + (0.60
m/s3)t3 where x is
measured in meters and t in seconds.
(a) A plot of the car's position versus time is which of the
following?
(b) Determine the instantaneous velocity of the car at
t = 5.0 s, using time intervals of 0.40 s, 0.20
s, and 0.10 s. (In order to better see the limiting process
keep at least three decimal places...
You walk for 6.44 km with at a constant velocity of 2.54 m/s due west, turn around, and then walk with an average velocity of 0.460 m/s due east. From your starting point to your destination, your overall average velocity is 1.26 m/s due west. During the trip, how far east did you walk?
2. A fastball crosses the plate with a speed of 40 m/s and an angle of 5.0° relative to the horizontal. The batter hits it for a home run, launching it with 49 m/s at an angle of 35.0° to the horizontal. Mass of the baseball is 0.15 kg. a) What is the change in velocity in x-direction (Avx) and y-direction (Avy), and the change in velocity of the ball (Av)? b) What is magnitude of the impulse the baseball...
You are driving to the grocery store at 25 m/s . You are 110 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.70 s and that your car brakes with constant acceleration. -How far are you from the intersection when you begin to apply the brakes? -What acceleration will bring you to rest right at the intersection? -How long does it take you to stop? A rock is tossed straight up with...
You walk for 6.44 km at a constant speed of 2.54 m/s due west, turn around, and then walk with an average speed of 0.440 m/s due east. From your starting point to your destination, the magnitude of your overall average velocity (!) is 1.25 m/s (due west). During the trip, how far east did you walk (i.e. how many meters due east have you been walking after making the turn)?
You throw a ball towards a wall with a speed of 25 m/s and at an angle of theta o= 40 degrees above the horizontal. The wall is at a distance of 22 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? (b) What are the (i) horizontal and (ii) vertical components of its velocity as it hits the wall?